EP1225515A1 - Device for supplying power to a bus - Google Patents

Abstract

A bus subscriber node (2) having a feed module (10) and means (9) for transmitting and/or receiving information by way of the bus (1) has a switch module (11) which is actuatable by way of a switching logical member (12) and by which the feed module (10) can be connected to the bus (1) or by which the feed module (10) can be separated from the bus (1). The bus subscriber node (2) also has a memory cell (14) and a monitoring member (13) for detecting a current supplied by the feed module (10). The switching logical member (12) is coupled to the memory cell (14) and the monitoring member (13) in such a way that the feed module (10) can be separated from the bus (1) on the basis of an item of information stored in the memory cell (14) or on the basis of a certain current level detected by the monitoring member (13). With the memory cell (14) the bus subscriber node (2) can be configured as a feeding or as a non-feeding bus subscriber node and can be used in communication networks with central and decentral feed.

Description

The invention relates to a device in the preamble of claim 1 Art.

Such devices are suitable for power supply for a bus, the information and energy from bus participants. The facility is preferably in a Building automation system - which is also referred to as a building management system - used. There are usually a large number in the building automation system Bus participants connected to each other via a bus, one bus participant an example of a device for monitoring, control and / or regulation of Process variables such as room temperature, air humidity or brightness.

Decentralized buses are known, in which each bus participant either one is feeding or a non-feeding bus participant. Are also known centrally powered buses, where the bus power is supplied from only one Central feeding takes place while the other bus participants are non-feeding Are bus participants.

A bus node is known (EP 0 749 070 A), which is a supply module Decision device and a measuring device for detecting the current situation having. The decision-making body decides automatically and only on the basis of the current situation, whether the feed module feeds the bus or not.

It has been shown that bus systems with few subscriber nodes are advantageous decentralized and bus systems with a relatively large number of subscriber nodes, however, more advantageous be fed centrally. It is quite realistic that in a From a certain point in time, the expansion of the bus system can also be advantageous the type of supply is to be adjusted from central to decentralized or vice versa.

The invention has for its object a central or for a bus node to propose decentrally feedable bus systems, which as feeder or as non-feeding bus node can be configured with little effort is implementable.

According to the invention, this object is achieved by the features of claim 1 solved. Advantageous configurations result from the dependent claims.

Exemplary embodiments of the invention are described in more detail below with reference to the drawing explained.

Fig. 1

ein Datenkommunikationsnetz mit einem Bus und Teilnehmerknoten,

Fig. 2

ein Blockschaltbild eines konfigurierbaren Teilnehmerknotens,

Fig. 3

eine Steuerschaltung für ein Schaltermodul des Teilnehmerknotens, und

Fig. 4

ein Drosselmodul des Teilnehmerknotens.

Show it:

Fig. 1

a data communication network with a bus and subscriber nodes,

Fig. 2

a block diagram of a configurable node,

Fig. 3

a control circuit for a switch module of the subscriber node, and

Fig. 4

a throttle module of the subscriber node.

In Fig. 1, 1 means a bus and 2 and 3 several connected to the bus Bus subscriber nodes, which are usually arranged spatially distributed on bus 1.

A first, configurable variant 2 of the bus subscriber nodes has its own electrical supply, which can be used to supply bus 1. A second variant 3 of the bus subscriber node does not have its own feeding device. at Demand - and therefore shown in dashed lines - is a central power supply unit 4 am Bus 1 connected.

The bus 1 is used both for information and energy transmission and is preferably a two-wire bus, for example a twisted double line (twisted Pair).

A bus subscriber node 2 shown in FIG. 2 has a transceiver 9, a supply module 10, a switch module 11, a logic element 12 Monitoring member 13 and a memory cell 14. The switch module 11 has a voltage input 15, a voltage output 16 and one Control input 17 on.

The feed module 10 is looped via the switch module 11 on the bus 1 connected so that the feed module 10 depending on the state of the switch module 11 feeds bus 1, or is separated from bus 1.

In an advantageous embodiment of the bus node 2, the Voltage input 15 of the switch module 11 with a first pole 20 of the Feed module 10 connected. The voltage output 16 is on a first line 21 of the bus 1, the voltage output 16 advantageously with a Throttle module 22 is connected to the first line 21. A second pole 25 of the Feed module 10 is connected via the monitoring element 13 to a second line 26 of the Bus 1 performed, with the throttle module 22 advantageously interposed is. On the output side, the logic element 12 is connected to the control input 17 of the Switch module 11 connected. The link 12 is on the input side with a Output 27 of the monitoring element 13 and connected to the memory cell 14, wherein if necessary for isolation between the memory cell 14 and the Linking element 12 a galvanic isolating element 28, for example an optocoupler, is inserted.

The information of the memory cell 14 can be changed by a microprocessor 30. It it goes without saying that instead of the microprocessor 30 also a microcomputer can be used with integrated output ports, in which case the Memory cell 14 is realized by an output port of the microcomputer.

The transceiver 9 is connected to the bus 1 and via a bidirectional Signal line 31 connected to the microprocessor 30 and as an example So-called UART component (universal asynchronous receiver transmitter) realized. For example, if a microcomputer is used instead of the microprocessor 30 the transceiver 9 can also be integrated in the microcomputer.

If necessary, the bidirectional signal line 31 points between the microprocessor 30 and the transceiver 9 further galvanic isolating elements 32, for example Optocoupler.

A current flowing between the feed module 10 and the bus 1 is through the Monitoring element 13 measurable. The monitoring element 13 is functionally so designed that the output 27 delivers a predefined signal when the measured Current exceeds a certain level. The link 12 is with the memory cell 14 and the monitoring element 13 coupled that the Supply module 10 on the basis of information stored in memory cell 14 or due to a certain current level detected by the monitoring element 13 by the switch module 11 controlled by the link 12 from the bus 1 is separable.

The information of the memory cell 14 can be set via the microprocessor 30 in such a way that that the supply module 10 basically via the switch module 11 on the bus 1 connected or disconnected from bus 1, so that bus node 2 is configurable as a feeding or as a non-feeding bus node 2. A Instructions for changing the information of the memory cell 14 can in principle Via the bus 1 via transceiver 9 or via one at subscriber node 2 connected service device 35 (Fig. 1) can be entered. In the latter case points the subscriber node 2 advantageously one with the microprocessor 30 connected terminal connection 36.

An electrical power supply 5 for the feed module 10 and the Microprocessor 30 is advantageously galvanically isolated via transformer windings 6 and 7 the feed module 10 and led to the microprocessor 30.

In a cost-effective implementation of the node 2 is advantageous a control circuit according to the structure shown in principle in FIG. 3 used. In an advantageous implementation, the switch module 11 (FIG. 2) essentially by a commercially available integrated voltage regulator 37 with three Connections realized, the output side with a diode 38 and one Voltage divider 39a and 39b is connected, the tap of the Voltage divider 39a, 39b is guided to the control input 17. The example is Voltage regulator an LM317 from National Semiconductor. The functionality of the Link 12 is essentially by two collector side with the Control input 17 of the switch module 11 or of the voltage regulator 37 connected transistors T1 and T2 reached. A first transistor T1 is the Output circuit of the galvanic isolating element 28 implemented as an optocoupler. A photodiode D1 of the input circuit of the galvanic isolating element 28 is included the memory cell 14 and via a resistor R with a corresponding one Food potential 40 connected. A second transistor T2 is also part of the Monitoring element 13, which also has a measuring resistor Rm for detecting a includes current flowing between the feed module 10 (FIG. 2) and the bus 1.

The throttle module 22 and the transceiver 9 are on top of each other agreed that bit coding according to a desired standard - exemplary according to EIB (European Installation Bus) for twisted pair (EIBA Handbook Series, System Specifications, Medium Dependent Layers, EIB Implementation on Twisted Pair) - is feasible.

The choke module 22 advantageously has choke coils 41 and 42 (FIG. 4), one of which first choke coil 41 in principle between the first pole 20 of the Supply module 10 and the first line 21 of the bus 1 and a second Choke coil 42 in series between the second pole 25 of the feed module 10 and the second line 26 of the bus 1 is arranged. Implemented to that in FIG. 3 Control circuit shown is the first choke coil 41 between the Switch module 11 switched first pole 20 of the feed module 10 and the first Line 21 of the bus 1 and the second choke coil 42 between the Monitoring module 13 monitored the second pole 25 of the feed module 10 and the second line 26 of the bus 1 arranged. Subscriber node 2 is optimal the bus 2 adjustable if parallel to the choke coils 41 and 42 ohmic Resistors 43 and 44 are arranged.

The bus node 2 with the supply module 10, the switch module 11, the Linking element 12, the memory cell 14 and the monitoring element 13 can be in Communication networks with central or decentralized supply can be used because the feed module 10 due to a stored in the memory cell 14 Information controlled by software as either feeding or non-feeding Subscriber node is configurable.

Claims (7)

Device for connecting to a bus (1), with means (9) for sending and / or receiving information via the bus (1), with a feed module (10), marked by means of a switch module (11) which can be controlled via a link (12) and by means of which the supply module (10) can be switched to the bus (1) or by which the supply module (10) can be separated from the bus (1), by a monitoring element (13) for detecting a current supplied by the supply module (10), and through a memory cell (14), wherein the logic element (12) is coupled to the memory cell (14) and the monitoring element (13) such that the supply module (10) is based on information stored in the memory cell (14) or on the basis of a certain current level from the bus detected by the monitoring element (13) (1) is separable. Device according to claim 1, characterized in that the bus (1) is a two-wire bus. Device according to one of the preceding claims, characterized in that the information of the memory cell (14) can be changed by a microprocessor (30) or microcomputer. Device according to claim 3, characterized in that the memory cell (14) is realized by an output port of the microprocessor (14) or microcomputer. Device according to one of the preceding claims, characterized in that the information of the memory cell (14) is connected to the logic element (12) via a galvanic separation (28). Device according to one of the preceding claims, characterized in that the switch module (11) has an integrated voltage regulator. Device according to one of the preceding claims, characterized by a throttle module (22) with at least one coil (41; 42) arranged in series in a bus feed line (21; 26).

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